commands/box: update gives nice message if no box
Fix failing test
core: content-type is case insensitive for metadata check [GH-4369]
communicators/ssh: nicer errors for SSH exceptions [GH-4367]
commands/box/update: proper provider is updated [GH-4374]
commands/plugin: error if windows with space in dir [GH-4351]
core: better messaging around box add not existing [GH-4414]
Ensure rsync_post has find permissions on smartos
Merge pull request #4415 from sax/smartos_rsync

guests/smartos: rsync_post has find permissions on smartos